Compositions containing diesters or polyesters of naphthalene dicarboxylic acid and methods for imparting hair gloss and to provide hair color and hair dye stabilization

ABSTRACT

A hair-treating composition containing a diester or polyester of a naphthalene dicarboxylic acid having compound formula (I) or (II), or mixtures; for imparting gloss and/or hair color stabilization: ##STR1## wherein each R 1 , same or different, is an alkyl group having 1 to 22 carbon atoms, a diol having the structure HO--R 2  --OH, or a polyglycol having the structure HO--R 3  --(--O--R 2  --) m  --OH, wherein R 2  and R 3 , same or different, are each an alkylene group, straight chain or branched, having 1 to 6 carbon atoms, and wherein m and n are each 1 to about 100, or a mixture thereof. These diesters and polyesters of formula (I) or (II) are quite effective in stabilizing the dibenzoylmethane derivative UV-A filter compounds making them more effective, and effective for longer periods of time.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part of application Ser. No.09/276,051 filed Mar. 25, 1999, now U.S. Pat. No. 5,993,789.

FIELD OF THE INVENTION

The present invention is directed to compositions for topicalapplication to hair to impart gloss and to stabilize natural and/orsynthetic hair color. More particularly, the present invention isdirected to the use of diesters and/or polyesters of a naphthalenedicarboxylic acid that are surprisingly effective in imparting gloss andfor stabilizing hair color against fading. The diesters and polyestersof naphthalene dicarboxylic acid stabilize natural hair color and hairdyes and impart gloss to the hair. In addition, as described in moredetail in the parent application, now U.S. Pat. No. 5,993,789, thecomposition absorbs UV radiation.

BACKGROUND OF THE INVENTION AND PRIOR ART

It is well known that ultraviolet light having a wavelength betweenabout 280 nm or 290 nm and 320 nm (UV-B) is harmful to human skin,causing burns that are detrimental to the development of a good sun tan.UV-A radiation, while producing tanning of the skin, also can causedamage, particularly to very lightly colored, sensitive skin, leading toreduction of skin elasticity and wrinkles.

Therefore, a sunscreen composition should include both UV-A and UV-Bfilters to prevent most of the sunlight within the full range of about280 nm to about 400 nm from damaging human skin.

The UV-B filters that are most widely used commercially in sunscreencompositions are paramethoxycinnamic acid esters, such as 2-ethylhexylparamethoxycinnamate, commonly referred to as octyl methoxycinnamate orPARSOL® MCX, having an ethyl radical extending from the 2 position ofthe hexyl long chain backbone; oxybenzone; and octyl salicylate.

The UV-A filters most commonly used in commercial sunscreen compositionsare the dibenzoylmethane derivatives, particularly 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL® 1789), and 4-isopropyldibenzoylmethane (EUSOLEX 8020). Other dibenzoylmethane derivativesdescribed as UV-A filters are disclosed in U.S. Pat. Nos. 4,489,057;4,387,089 and 4,562,067 and 5,670,140, hereby incorporated by reference.It is also well known that the above described and most commonly usedUV-A filters, particularly the dibenzoylmethane derivatives, such asPARSOL® 1789, suffer in photochemical stability when used alone or incombination with the above-described most commercially used UV-Bfilters. Accordingly, when used alone or when combined with a UV-Bfilter, such as 2-ethylhexyl paramethoxycinnamate (PARSOL® MCX),oxybenzone and/or octyl salicylate, the PARSOL® 1789 becomes lessphotochemically stable necessitating repeated, frequent coatings overthe skin for sufficient UV radiation protection.

In accordance with one embodiment of the present invention, it has beenfound, quite surprisingly, that by including a diester and/or polyesterof one or more naphthalene dicarboxylic acids of formula (I), into acosmetic sunscreen formulation containing a UV-A dibenzyolmethanederivative, particularly PARSOL® 1789, and/or 4-isopropyldibenzoylmethane (EUSOLEX 8020), the dibenzyolmethane derivative isphotochemically stabilized so that the dibenzyolmethanederivative-containing sunscreen composition with or without additionalsunscreen agents, such as oxybenzone and/or octyl methoxycinnamate(ESCALOL 567), is more effective for filtering out UV-A radiation; thecomposition filters more UV-A radiation for longer periods of time; and,therefore, the sunscreen formulation need not be applied to the skin asfrequently while maintaining effective skin protection against UV-Aradiation.

In accordance with another important advantage of the present invention,it has been found that the diesters and polyesters of naphthalenedicarboxylic acids can also absorb UV light in the most damaging rangeof about 280-300 nm, especially over the 280 and 295 nm wavelengthabsorbance peaks shown in FIG. 9.

By the addition of UV-B filter compounds, such as octylmethoxycinnamate, octyl salicylate, and/or oxybenzone, the compositionsof the present invention can maintain surprisingly effective hair colorprotection and can protect against UV radiation both in the UV-A andUV-B range, with or without common sunscreen additives, such asoctocrylene, and/or titanium dioxide. The composition reaches asurprisingly high SPF without solid additives, such as titanium dioxide,thereby providing an exceptionally elegant feel that can be appliedeasily in a continuous coating for complete coverage and sunscreenprotection. In the preferred compositions, the ratio of UV-A to UV-Bfilter compounds is in the range of about 0.1:1 to about 3:1, preferablyabout 0.1:1 to about 0.5:1, most preferably about 0.3:1 to about 0.5:1.Quite surprisingly, the preferred compositions of the present inventionachieve unexpectedly high SPF, e.g., higher than SPF 12 in one preferredcomposition, and higher than SPF 20 in another preferred composition,with the addition of surprisingly low amounts of other UV-B and UV-Afilters to the PARSOL 1789, and without solid blocking compounds, suchas TiO₂.

In accordance with another embodiment of the present invention, thediesters and polyesters of naphthalene dicarboxylic acid, of the presentinvention, impart gloss to hair, and/or stabilize hair color againstfading, particularly for hair containing a synthetic dye.

SUMMARY OF THE INVENTION

In brief, the present invention is directed to gloss-imparting and/orhair color protecting compounds comprising a diester and/or polyester ofa naphthalene dicarboxylic acid, while providing UV absorption.

The active gloss-imparting and/or hair color stabilizing compounds ofthe present invention are diesters and polyesters of a naphthalenedicarboxylic acid. The diesters and polyesters are reaction products of(a) a naphthalene dicarboxylic acid having the structure: ##STR2## and(b) an alcohol having the structure R¹ --OH, or a diol having thestructure HO--R² --OH, or a polyglycol having the structure HO--R³--(--O--R² --)_(m) --OH, wherein R¹ is an alkyl group, straight chain orbranched, having 1 to 22 carbon atoms, R² and R³, same or different, areeach an alkylene group, having 1 to 6 carbon atoms, and wherein m and nare each 1 to about 100, preferably 1 to about 10, more preferably 2 toabout 7, or a mixture thereof.

A diester of the present invention has the structure: ##STR3## whereinR¹ is as defined above.

The diesters and polyesters of naphthalene dicarboxylic acids of thepresent invention have the general formula (I): ##STR4## wherein R² andR³, same or different, are each an alkylene group having 1 to 6 carbonatoms, and n=1 to about 100, preferably 1 to about 10, more preferably 2to about 7.

Alternatively, the hair color stabilizing diesters and polyesters of thepresent invention can be end-capped with an alcohol or an acid. Theend-capped polyesters have the structural formula (II): ##STR5## whereinR¹ and R² and n are as defined above, with reference to formula (I). Thetwo R¹ s in formula (II) may be the same or different.

The preferred diesters and polyesters of the present invention have aweight average molecular weight of about 244 to about 4000, and morepreferably about 450 to about 1500. To achieve the full advantage of thepresent invention, the diester or polyester has a weight averagemolecular weight of about 500 to about 1000.

The naphthalene dicarboxylic acid is selected from the group consistingof 1,2-naphthalene dicarboxylic acid; 1,3-naphthalene dicarboxylic acid;1,4-naphthalene dicarboxylic acid; 1,5-naphthalene dicarboxylic acid;1,6-naphthalene dicarboxylic acid; 1,7-naphthalene dicarboxylic acid;1,8-naphthalene dicarboxylic acid; 2,3-naphthalene dicarboxylic acid;2,6-naphthalene dicarboxylic acid; 2,7-naphthalene dicarboxylic acid,and mixtures thereof. Preferred dicarboxylic acids are the 2,6-, 1,5-and 1,8-naphthalene dicarboxylic acids.

The alcohol R¹ --OH can be, for example, methanol, ethanol, propanol,isopropyl alcohol, n-butanol, sec-butanol, isobutyl alcohol, tert-butylalcohol, amyl alcohol, 1-hexanol, 1-octanol, 1-decanol, isodecylalcohol, 1 -undecanol, 1-dodecanol, 1-tridecyl alcohol, 1-tetradecanol,1-hexadecanol, 1 -octadecanol, 1-eicosonol, 1-decosonol, 2-ethylhexylalcohol, 2-butyloctanol, 2-butyldecanol, 2-hexyldecanol, 2-octyldecanol,2-hexyldodecanol, 2-octyldodecanol, 2-decyltetradecanol, and mixturesthereof.

The glycol or polyglycol can be, for example, ethylene glycol, propyleneglycol, 1,2-propanediol, diethylene glycol, triethylene glycol,tetraethylene glycol, dipropylene glycol, tripropylene glycol, methylpropanediol, 1,6-hexanediol, 1,3-butanediol, 1,4-butanediol, PEG-4through PEG-100, PPG-9 through PPG-34, pentylene glycol, neopentylglycol, trimethylpropanediol, 1,4-cyclohexanedimethanol,2,2-dimethyl-1,3-propanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol,and mixtures thereof.

Surprisingly, it has been found that these diesters and polyesters ofnaphthalene dicarboxylic acids are quite effective in imparting hairgloss and preserving a desired natural or dyed hair color, whileproviding the hair with sunscreen protection, when contained in acomposition in an amount of at least about 0.1% by weight, up to about20% by weight, preferably about 0.2% to 10% by weight, more preferablyabout 0.5 % to 10% by weight.

Accordingly, one aspect of the present invention is to provide acomposition that includes a diester or polyester of one or morenaphthalene dicarboxylic acids as a hair gloss-imparting compound, andas a hair color preserving compound, said naphthalene dicarboxylic aciddiester/polyester compounds having formula (I) or (II).

Another aspect of the present invention is to provide a composition forapplication to human hair that photochemically stabilizesdibenzoylmethane derivatives, particularly PARSOL® 1789, and capable ofincreasing the sunscreen protection factor (SPF) achievable forsunscreen compositions containing the dibenzoylmethane derivatives.

Another aspect of the present invention is to provide an improved,stable composition containing a diester and/or polyester of anaphthalene dicarboxylic acid that increases the effectiveness ofdibenzoylmethane derivative sunscreen compounds, particularly4-(1,1dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL® 1789), in SPFand in duration, for protection of human hair.

Another aspect of the present invention is to provide a stable, broadspectrum sunscreen composition for topical application to human hairthat has a SPF of at least 12 and provides substantial protectionagainst the full range of solar UV radiation (280-400 nm), includingabout 4-15% by weight of an ester and/or polyester of naphthalenedicarboxylic acid, and contains less than 7% and preferably less than6.1% of sunscreen composition additives selected from the groupoxybenzone and avobenzone (PARSOL 1789).

Still another aspect of the present invention is to provide amoisturizing composition for topical application to human hair thatprovides an SPF of at least 20, including about 4-15% by weight of anester and/or polyester of naphthalene dicarboxylic acid.

The above and other aspects and advantages of the present invention willbecome more apparent from the following detailed description of thepreferred embodiments, taken in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the photostability of PARSOL® 1789 or4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane as a function ofconcentration of the naphthalene dicarboxylic acid esterphotostabilizers of the present invention;

FIG. 2 is a graph showing the photostability (photoinstability) or UVabsorbance capability, of a sunscreen composition containing 1% byweight avobenzone when subjected to ultraviolet light of varyingwavelengths;

FIG. 3 is a graph showing photostability, or UV absorbance capability,of a sunscreen compositing containing 1% by weight avobenzone whenstabilized with 4% by weight of one of the naphthalene dicarboxylic acidpolyesters of the present invention;

FIG. 4 is a graph showing photostability, or UV absorbance capability,of a sunscreen composition containing 1% by weight avobenzone whenstabilized with 8% by weight of one of the naphthalene dicarboxylic acidpolyesters of the present invention;

FIG. 5 is a graph showing the photostability of a sunscreen compositioncontaining 3% by weight oxybenzone/1% by weight avobenzone, without aphotostabilizer of the present invention;

FIG. 6 is a graph showing the photostability of a sunscreen compositioncontaining 3% by weight oxybenzone/ 1% by weight avobenzone, and 8% byweight of one of the naphthalene dicarboxylic acid polyesterphotostabilizers of the present invention;

FIG. 7 is a graph showing the photostability of a sunscreen compositioncontaining 1% by weight avobenzone and 4% by weight of an octocrylenephotostabilizer;

FIG. 8 is a graph showing the photostability of a sunscreen compositioncontaining 1% by weight avobenzone and 4% by weight of an oligomer(MW=˜1500) of a naphthalene dicarboxylic acid ester of the presentinvention; and

FIG. 9 is a graph showing the UV absorbance of the naphthalicdicarboxylic acid of Example 1 at 17.5 ppm in tetrahydroforan (THF).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred compositions of the present invention include, optionally,about 0.5% to about 5%, preferably about 0.5% to about 3% of adibenzoylmethane derivative UV-A filter compound, such as4-(1,1-dimethylethyl)-4'-methoxy-dibenzoylmethane (PARSOL® 1789) andabout 1% to about 10% by weight of a diester and/or polyester of one ormore naphthalene dicarboxylic acid photostabilizer/solubilizer for thedibenzoylmethane derivative, having formula (I) or (II). ##STR6##wherein each R¹, same or different, is an alkyl group having 1 to 22carbon atoms, or a diol having the structure HO--R² --OH, or apolyglycol having the structure HO--R³ --(--O--R² --)_(m) --OH, and,wherein R² and R³, same or different, are each an alkylene group,straight chain or branched, having 1 to 6 carbon atoms, wherein m and nare each 1 to about 100, preferably 1 to about 10, more preferably 2 toabout 7, or a mixture thereof.

The compounds of formula (I) and (II) are well known for other purposes.

EXAMPLES Example 1

The photostabilizing effect of a polyester of 2,6-naphthalenedicarboxylic acid and tripropylene glycol with a 2-butyloctanolterminator was determined as follows. First, the following formulationscontaining 1% PARSOL® 1789 were prepared in the usual way by dissolvingthe PARSOL®1789 in the oily phase and premixing the water phase, thenemulsifying the oil by adding it to the water phase:

    ______________________________________                                                   Formula A                                                          Ingredient (Standard)                                                                             Formula B                                                                              Formula C                                                                            Function                                  ______________________________________                                        hexyldecyl benzoate                                                                      7.50%    7.50%    7.50%  emollient,                                &                                   solvent                                   butyloctyl benzoate                                                           isopropyl myristate                                                                      5.00%    5.00%    1.00%  co-solvent                                avobenzone 1.00%    1.00%    1.00%  UV-A                                                                          sunscreen                                 myristyl myristate                                                                       4.00%    0.00%    0.00%  bodying                                                                       agent                                     polyester of                                                                             0.00%    4.00%    8.00%  photostabilizer                           2,6-naphthalene                                                               dicarboxylic acid                                                             sorbitan oleate                                                                          0.20%    0.20%    0.20%  particle size                                                                 reducer                                   dimethicone                                                                              0.10%    0.10%    0.10%  lubricant                                 copolyol                                                                      carbomer   0.20%    0.20%    0.20%  thickener,                                                                    stabilizer                                acrylates/C10-30                                                                         0.25%    0.25%    0.25%  emulsifier                                alkyl acrylates                                                               crosspolymer                                                                  deionized water                                                                          Q.S.     Q.S.     Q.S.   solvent,                                                                      carrier                                   disodium EDTA                                                                            0.05%    0.05%    0.05%  chelator                                  hydroxypropyl                                                                            0.20%    0.20%    0.20%  film former                               methylcellulose                                                               glycerin   4.00%    4.00%    4.00%  humectant                                 butylene glycol                                                                          2.00%    2.00%    2.00%  humectant,                                                                    solvent                                   phenoxyethanol &                                                                         0.50%    0.50%    0.50%  preservative                              parabens                                                                      triethanolamine                                                                          0.45%    0.45%    0.45%  neutralizer                               ______________________________________                                    

The photostability of the PARSOL® 1789 was determined by spreadingmeasured amounts of the emulsions on 5 cm square slides of Vitro-skin,then irradiating the slides with a solar simulator. Absorbancemeasurements in the UV-A range (315-380 nm) were taken by a Labsphere UVTransmittance Analyzer before and after irradiation and the resultscompared.

After irradiation with 5 MED (minimal erythermal dose), the loss of UV-Aabsorbance by the PARSOL® 1789 was considerably lower in theformulations containing the PARSOL® 1789 in combination with 4% and 8%of the naphthalene dicarboxylic polymer when compared to the formulationcontaining the PARSOL® 1789 alone (compare FIGS. 2, 3 and 4). Further,the loss of absorbance in the UV-A range is reduced in a manner relatedto the concentration of the naphthalene dicarboxylic polymer, as can beseen in the graph of FIG. 1.

Example 2

The photostabilizing effect of a polyester of 2,6-naphthalenedicarboxylic acid, tripropylene glycol, and diethylene glycol with a2-ethylhexanol terminator was compared to octocrylene, a well knownphotostabilizer for PARSOL® 1789. The following formulations wereprepared in the usual manner, each containing 1% PARSOL® 1789 and 4% ofeither octocrylene or a polyester of 2,6-naphthalene dicarboxylic acid:

    ______________________________________                                        Ingredient      Formula A                                                                              Formula B                                                                              Function                                    ______________________________________                                        hexyldecyl benzoate &                                                                         7.50%    7.50%    emollient,                                  butyloctyl benzoate               solvent                                     isopropyl myristate                                                                           5.00%    5.00%    co-solvent                                  avobenzone      1.00%    1.00%    UV-A                                                                          sunscreen                                   octocrylene     4.00%    0.00%    UV-B/UV-A                                                                     sunscreen                                   polyester of 2,6-naphthalene                                                                  0.00%    4.00%    photostabilizer                             dicarboxylic acid                                                             sorbitan oleate 0.20%    0.20%    particle size                                                                 reducer                                     dimethicone copolyol                                                                          0.10%    0.10%    lubricant                                   carbomer        0.20%    0.20%    thickener,                                                                    stabilizer                                  acrylates/C10-30 alkyl acrylates                                                              0.25%    0.25%    emulsifler                                  crosspolymer                                                                  deionized water Q.S.     Q.S.     solvent,                                                                      carrier                                     disodium EDTA   0.05%    0.05%    chelator                                    hydroxypropylmethylcellulose                                                                  0.20%    0.20%    film former                                 glycerin        4.00%    4.00%    humectant                                   butylene glycol 2.00%    2.00%    humectant,                                                                    solvent                                     phenoxyethanol & parabens                                                                     0.50%    0.50%    preservative                                triethanolamine 0.45%    0.45%    neutralizer                                 ______________________________________                                    

After following the protocol described above in Example 1, the followingresults were obtained:

    ______________________________________                                                       Formula A                                                                            Formula B                                               ______________________________________                                        Average loss of UV-A                                                                           26.33%   22.36%                                              Average loss of UV-B                                                                           25.15%   18.29%                                              Average loss of SPF                                                                            26.82%   20.35%                                              ______________________________________                                    

The test demonstrated that the naphthalene dicarboxylic acid derivedpolyester is comparable to octocrylene in its ability to photostabilizePARSOL® 1789.

Example 3

The following example is a preferred formulation for topical applicationto human hair to impart hair gloss and to stabilize natural andsynthetically dyed hair from fading:

    ______________________________________                                        HAIR GLOSS AND HAIR COLOR STABILIZATION                                       WITH DIETHYLHEXYL NAPHTHALATE                                                 Chemical Name    Trade Name    % w/w                                          ______________________________________                                        A   Polyacrylamide (&) C13-14                                                                      Sepigel 305 (Seppic)                                                                        1.50                                           Isoparaffin (&) Laureth-7                                                 A   Propylene glycol               40.00                                      B   Phenoxyethanol   Sepicide LD (Seppic)                                                                        1.00                                       B   Fragrance                      0.20                                       B   Color            Dichrona RG + q.s.                                                            Dichrona GY (Merck)                                      B   Water                          q.s. 100.00                                C   Cyclomethicone   DC345 (Dow Corning)                                                                         11.20                                      C   Diethylhexyl naphthalate                                                                       RX 13752 (C.P. Hall)                                                                        2.80                                       C   Cyclomethicone (&)                                                                             Q2/1401       0.10                                           Dimethiconol     (Dow Corning)                                            ______________________________________                                         Procedure                                                                     1. Combine "A" ingredients carefully.                                         2. Add "B" ingredients in order shown.                                        3. Premix "C" ingredients. Add to "A" plus "B".                          

What is claimed is:
 1. A composition having an SPF of at least 2, fortopical application to hair, in a cosmetically acceptable carrier,comprising at least about 0.1% by weight of a diester or polyester ofnaphthalene dicarboxylic acid selected from the group consisting offormula (I), formula (II) and mixtures thereof: ##STR7## wherein eachR¹, same or different, is selected from the group consisting of an alkylgroup having 1 to 22 carbon atoms; a diol having the structure HO--R²--OH; and a polyglycol having the structure HO--R³ --(--O--R² --)_(m)--OH, wherein R² and R³, same or different, are each an alkylene group,straight chain or branched, having 1 to 6 carbon atoms, and wherein mand n are each in the range of 1 to about 100, or a mixture thereof. 2.A composition in accordance with claim 1, further including adibenzoylmethane derivative in an amount of at least 0.5% by weight, andwherein the molar ratio of said diester or polyester compound havingformula (I) or (II) to said dibenzoylmethane derivative is about 0.1:1to about 10:1.
 3. A composition in accordance with claim 2, wherein themolar ratio of said diester or polyester compound having formula (I) or(II) to said dibenzoylmethane derivative is about 0.1:1 to about 0.3:1.4. A composition in accordance with claim 3, wherein saiddibenzoylmethane derivative is selected from the group consisting of4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane; 4-isopropyldibenzoylmethane; and mixtures thereof.
 5. A composition in accordancewith claim 4, wherein the dibenzoylmethane derivative is4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane.
 6. A composition inaccordance with claim 5, wherein the dibenzoylmethane derivative isincluded in the composition in an amount of about 0.5% to about 5% byweight of the composition.
 7. A composition in accordance with claim 6,wherein the dibenzoylmethane derivative is included in the compositionin an amount of about 0.5% to about 3% by weight of the composition. 8.A composition in accordance with claim 1, wherein the diester orpolyester compound is included in the composition in an amount of about0.1% to about 20% by weight of the composition.
 9. A composition inaccordance with claim 7, wherein the diester or polyester compound is apolyester of 2,6-naphthalene dicarboxylic acid.
 10. A method ofstabilizing the color of natural or synthetic dye-containing haircomprising topically applying to said hair a composition, in acosmetically acceptable carrier, comprising 0.1% to 20% by weight of adiester or polyester of a naphthalene dicarboxylic acid stabilizingcompound selected from the group consisting of formula (I), formula (II)and mixtures thereof: ##STR8## wherein each R¹, same or different, isselected from the group consisting of an alkyl group having 1 to 22carbon atoms; a diol having the structure HO--R² --OH; and a polyglycolhaving the structure HO--R³ --(--O--R² --)_(m) --OH, wherein R² and R³,same or different, are each an alkylene group, straight chain orbranched, having 1 to 6 carbon atoms, and wherein m and n are each inthe range of 1 to about 100, or a mixture thereof.
 11. A method inaccordance with claim 10, wherein the composition includes adibenzoylmethane derivative in an amount of about 0.5% to about 5%, andwherein the molar ratio of said diester or polyester compound havingformula (I) or (II) to said dibenzoylmethane derivative is about 0.1:1to about 10:1.
 12. A method in accordance with claim 11, wherein themolar ratio of said diester or polyester compound having formula (I) tosaid dibenzoylmethane derivative is about 0.1:1 to about 0.3:1.
 13. Amethod in accordance with claim 12, wherein said dibenzoylmethanederivative is selected from the group consisting of4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane; 4-isopropyldibenzoylmethane; and mixtures thereof.
 14. A method in accordance withclaim 13, wherein the dibenzoylmethane derivative is4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane.
 15. A method inaccordance with claim 14, wherein the dibenzoylmethane derivative isincluded in the composition in an amount of about 0.5% to 3% by weightof the composition.
 16. A method of imparting gloss to human haircomprising topically applying to said hair, in a carrier, a diester orpolyester of a naphthalene dicarboxylic acid compound selected from thegroup consisting of formula (I), formula (II) and mixtures thereof:##STR9## wherein each R¹, same or different, is selected from the groupconsisting of an alkyl group having 1 to 22 carbon atoms; a diol havingthe structure HO--R² --OH; and a polyglycol having the structure HO--R³--(--O--R² --)_(m) --OH, wherein R² and R³, same or different, are eachan alkylene group, straight chain or branched, having 1 to 6 carbonatoms, and wherein m and n are each in the range of 1 to about 100, or amixture thereof.
 17. The method of claim 16, wherein the compositionfurther includes a dibenzoylmethane derivative in an amount of at least0.5% by weight.